High-resolution 3-D dielectric property models of the shallow subsurface: Integrating direct-push and georadar data

浅层地下高分辨率 3D 介电特性模型：集成直推数据和地理雷达数据

• 批准号: 48103875
• 负责人: Professor Dr. Peter Dietrich
• 金额: --
• 依托单位: Arbeitsgruppe Umwelt- und Ingenieurgeophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/48103875?language=en
• 关键词: resolution; dielectric; property; models; shallow

Within the past decades, georadar data analysis has been established as one of the key geophysical technologies for exploring the shallow subsurface. In typical geological, environmental, and engineering applications, the technique provides detailed 2-D/3-D images of the subsurface. However, the analysis of the resulting reflection images is usually limited to a structural interpretation, e.g., outlining geological or lithological boundaries. As accurate and reliable information on subsurface velocity variations is usually not available, the generation of reliable depth models is a remaining challenging problem. In addition, the development of practical approaches for a more quantitative interpretation providing estimates on petrophysical parameters and lithologies, respectively, is largely untapped. In this research project, we want to develop advanced analysis schemes to improve the depth oriented quantitative interpretation of georadar reflection data. The core of the planned development is the integration of direct-push parameter information into the georadar processing and interpretation flow. Using a special direct-push tool allows for extracting high-resolution vertical profiles of the electrical and dielectrical properties of the probed material. As these parameters guide georadar wave propagation, the direct-push data collected at single locations can be used to calibrate the 2-D/3-D georadar reflection signature. The resulting 2-D/3-D depth calibrated dielectric parameter information would also provide a link to further important petrophysical parameters (e.g., water content or porosity) needed in many site characterization studies.

在过去的几十年里，地质雷达数据分析已被确立为浅层地下勘探的关键地球物理技术之一。在典型的地质、环境和工程应用中，该技术提供了地下的详细2-D/3-D图像。然而，对所得反射图像的分析通常限于结构解释，例如，勾勒出地质或岩性的边界。由于地下速度变化的准确和可靠的信息通常是不可用的，可靠的深度模型的生成是一个仍然具有挑战性的问题。此外，开发实用的方法，提供更定量的解释，分别对岩石物理参数和岩性的估计，在很大程度上是未开发的。在本研究计划中，我们希望开发先进的分析方案，以提高地质雷达反射数据的深度定向定量解释。计划开发的核心是将直推参数信息集成到地质雷达处理和解释流程中。使用特殊的直推工具可以提取被探测材料的电和介电特性的高分辨率垂直剖面。由于这些参数引导地质雷达波的传播，在单个位置收集的直推数据可用于校准2-D/3-D地质雷达反射特征。所得到的2-D/3-D深度校准的介电参数信息还将提供到另外的重要岩石物理参数（例如，含水量或孔隙度）。